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DEHYDRATION AND MUSCLE CRAMPS

“Why do I get cramps sometimes but not others even though the workouts are the same?” “Why do I get cramps an hour or more after a workout?” “Why do I cramp when my teammates doing the same workout don’t?” “Why do I get cramps at night hours after doing anything that might have made my muscles tight ... or even when I’ve done nothing strenuous?” While most athletes and active people realize that dehydration and electrolytes have something to do with muscle cramps, I get lots of questions like these. To find some answers, let’s look at what normally happens in muscular activity using these diagrams of a single muscle cell in which K+ represents a potassium ion1 and Na+ a sodium ion, two vital electrolytes as we will see. Note that with the relaxed muscle cell there are proportionately more potassium ions inside the cell than in the fluids outside the cell while the opposite is true for sodium ions2).

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